Wednesday
July 23, 2014

Homework Help: stats

Posted by Judy and group on Thursday, April 1, 2010 at 4:45am.

8-A bakery stated that the average number of breads sold daily is 3000. An employee thinks that the actual
value might differ from this and wants to test this statement. The correct hypotheses are:
(1) H0 : = 3000 H1 : not= 3000
(2) H0 : > 3000 H1 : 3000
(3) H0 : 􀀹= 3000 H1 : = 3000
(4) H0 : > 3000 H1 : not= 3000
(5) H0 : 3000 H1 : > 3000
ANSWER: 1

9-A statistics practitioner formulated the following hypothesis: H0 : = 200 against H1 : < 200 and
learned that x = 190 n = 9 and = 50.
The pC value of the test is
(1) 0.6
(2) 0.2743
(3) 0.7743
(4) −0.2743
(5) Cannot be found with information given
ANSWER: 5 (we need the level of significance)

10-In a sample of 500 college students fifty percent of all college students attend schools within 50 miles of
their homes.
The probability that the population proportion will be between 0.45 and 0.55 is
(1) 0.4875
(2) 0.9818
(3) 0.4909
(4) 0.9750
(5) 0.5000
answer: 4

11-Suppose the mass of college students can be modeled by the normal distribution. We believe the mean
of the normal distribution is 72 kg. We randomly sample 18 students and find an average of 69 kg and a
standard deviation of 4kg.
A. The standard error of x is 0.9428
B. A t-statistic can be calculated and it is equal to −3.18
C. The degrees of freedom for the t-distribution will be 17
The correct statement(s) is(are)
(1) Only A
(2) All three statements are correct.
(3) B and C
(4) A and B
(5) A and C
ANSWER: 5

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